Which of the following classes of Chordates is credited with producing the first amniotic egg?
a) Class Amphibia
b) Class Aves
c) Class Chondrichthyes
d) Class Reptilia
e) Class Mammalia
Ans: d) Class Reptilia
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Which of the following types of information would be most useful in an effort to move a DNA fragment from one plasmid vector to another, using molecular cloning techniques?
A. DNA fingerprint data B. sequence of PCR primers C. data from cloning of Dolly the sheep D. restriction maps of the plasmids Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? · What key words does the question contain and what do they mean? Gather Content · What do you already know about molecular cloning techniques? Consider Possibilities · Consider the different answer options. Which can you rule out? Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
Answer the following statements true (T) or false (F)
1. All diseases caused by Rickettsia spp. are arthropodborne. 2. Viruses contain both DNA and RNA. 3. The cell walls of archaeans contain a thicker layer of peptidoglycan than bacterial cell walls. 4. On entering a bacterial cell, all bacteriophages immediately initiate the lytic cycle. 5. Mycoplasmas cannot grow on artificial media.
Four of the five people listed below were biologists
Select the exception. a. Lamarck b. Lyell c. Wallace d. Cuvier e. Darwin
A zygote forms
a. as soon as a sperm cell penetrates an egg cell. b. when the embryo implants in the uterine wall c. when a fertilized egg divides to produce two cells. d. after at least two divisions of a fertilized egg. e. after many divisions of a fertilized egg.